Federal law enforcement training can be divided into various categories, the most common being basic, agency-specific basic (ASB), advanced/specialized, and agency-advanced/specialized. To operate safely and effectively, U. S. special agents and criminal investigators must possess skills and knowledge regarding criminal and civil law and procedure, enforcement operations, physical techniques, and technical equipment, to mention a few. They must also be physically fit. While possession of a college degree can aid in obtaining employment in this profession, only extensive training provided at specialized facilities, combined with on-the-job training, can provide the skills and knowledge needed to perform the duties of a federal criminal investigator. As of 2012, there were 13,913 FBI agents, as of 2016, there were approximately 6,500 ICE-Homeland Security Investigations (HSI) agents, and as of 2011, there were 4,890 DEA agents in the United States.